Glycine-functionalized carbon quantum dots as chemiluminescence sensitization for detection of m-phenylenediamine

Abstract

A novel sensing system has been designed for the detection of m-phenylenediamine based on carbon quantum dots (CQDs)-improved chemiluminescence (CL) in a luminol–potassium permanganate (KMnO₄) system. The CQDs were synthesized by pyrolyzing a mixture of citric acid (CA) and glycine (Gly). Under the action of CQDs and KMnO₄, the luminol can be oxidized by synergy, which significantly increases the chemiluminescence intensity. In this work, it has been demonstrated that this facile methodology can offer a rapid, sensitive and reliable detection of m-phenylenediamine with a detection limit as low as 1.02 × 10⁻³ g L⁻¹ and a dynamic range from 2.0 × 10⁻³ to 3.0 × 10⁻¹ g L⁻¹, which shows a promising application prospect.